when you clean TB (throttle body) dont push the butterfly of TB you will end up buying new one
but two ways:
1. key on BUT NOT START - press the gas pedal with stone or else then clean (off course after removing filter housing)
clean it by rag and spray carbon, OR
2. dismount the TB - clean it but NEVER press the buterfly just spray 2 sides with carbon clean
3. install back correctly if one of the tubes is not plug in you will end up high and low rev automoatically horroful sound usually the very back small tube
4. THIS IS HOW YOU TO RESETTING THE ECU - mandatory to nissan micra / march (CANNOT BY DISCONNECT NEGATIVE BATTERY BECAUSE THIS IS DRIVE BY WIRE / THROTTLE BY WIRE) -
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1. key on wait until all indicators are on (no more than 3 seconds)
2. press GAS pedal 5 times (no more than 5 seconds) then release the pedal
3. wait no more than 7 seconds
4. press pedal again until the indicator blinks (usually no more than 15 second) IF MORE START FROM NO.1
5. if the indicator has been blinking release pedal one time than directly PRESS AGAIN GAS PEDAL until the blinking become faster than release the gas pedal and wait
6. CONGRAT you ECU/ECM HAS BEEN RESET
7. turn off key - drink coffee then start the engine